瞭解CUSP術語和路由邏輯

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已更新: 2017 年 9 月 29 日

文件 ID:212177

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簡介

本檔案將說明思科整合SIP代理(CUSP)通話路由邏輯。

作者：Joshua Meadows，思科TAC工程師。

必要條件

需求

思科建議您瞭解以下主題：

作業階段啟始通訊協定(SIP)一般知識
語音網路部署中CUSP的概念理解

技術

定義

字詞	定義
網路	SIP網路是本地介面的邏輯集合，在一般路由用途中可以將其視為同一介面。從<http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusp/rel9_1/gui_configuration/en_US/configuring_networks.html> 網路在邏輯上定義網路的區域。可以使用CUSP裝置上的介面定義網路，也可以使用特定埠提供分段。為實現此邏輯分段，可以配置單獨的偵聽埠。 (範例：偵聽埠14.50.245.9:5060、14.50.245.9:5062、14.50.245.9:5065可以使用單個CUSP第3層介面定義三個邏輯網路) 網路在邏輯上定義後，便可用於根據網路配置觸發器。附註：如果設定了偵聽埠，請確保將流量傳送到CUSP的裝置使用正確的埠。如果為CUCM流量設定偵聽埠14.50.245.9:5065，則必須確保CUCM將流量傳送到埠5065，而不是預設的5060。
觸發器	可以設定觸發器以標識傳入消息。觸發器可以識別入站網路、本地埠和遠端網路等。
伺服器組	伺服器組定義Cisco Unified SIP Proxy系統為每個網路互動的元素。從<http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusp/rel9_1/gui_configuration/en_US/configuring_server_groups.html> 伺服器組和路由組都可以用作路由表中的目標。伺服器組通常用於相同型別的冗餘裝置。 CUBE堆疊是伺服器組的良好示例。
路由組	路由組允許您指定網關和中繼的選擇順序。它允許您為傳出中繼選擇確定網關和埠清單的優先順序。從<http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusp/rel9_1/gui_configuration/en_US/configuring_route_groups.html> 伺服器組和路由組都可以用作路由表中的目標。路由組通常定義到達同一裝置的加權組目標。直接到CUCM的SIP中繼和到PSTN網關的SIP中繼以到達CUCM是路由組的典型示例。到CUCM的直接SIP中繼是首選方法，而PSTN路由則是備份。
路由表	您可以配置路由表，將SIP請求定向到其相應的目的地。每個路由表都包含一組基於查找策略進行匹配的金鑰。從<http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusp/rel9_1/gui_configuration/en_US/configuring_route_tables.html> CUSP中的路由表類似於第3層路由表。CUSP路由表由與第3層路由表中的網路類似的金鑰組成。路由表將鍵連結到目標。在CUSP路由表中鍵可以對映到以下路由型別以路由SIP消息： destination:可以將特定主機或本地配置的伺服器組配置為目標 route-group:具有一個或多個元素的本地配置的路由組 route-policy:路由策略可用於在路由表之間移動，類似CUCM中的轉換模式回應:CUSP可以傳送特定響應來終止呼叫嘗試，而不是路由SIP消息 default-sip: 遵循RFC 3263的簡單路由。附註：如果將Key對映到route-policy，請注意邏輯環路。
路由策略	路由策略指向路由表，並定義如何使用該路由表中的Key。範例：路由表名稱："FromCUCM105-RT" 查詢鍵匹配項："Prefix-Longest-Match" 查詢鍵："SIP報頭：「收件人」電話」通過將Key的定義與Key的配置值相分離，同一路由表能以不同方式使用。例如，一個路由策略可以將路由表的金鑰定義為TO的前綴：報頭，而另一個路由策略可以將路由表的金鑰定義為FROM的字首：標題。
路由觸發器	路由觸發器將觸發器連結到路由策略。從邏輯上說，如果SIP消息與觸發器匹配，則使用配置的路由策略。

總而言之，根據SIP偵聽埠使用Network標籤SIP消息。 Network可用於匹配Trigger。 Route Policy然後根據Trigger確定要使用的Route Table，並定義在何處查詢Key。 Route Table然後使用Key查詢將SIP消息路由到的位置（路由型別）。路由型別(主機、伺服器組、路由組等)將用於將SIP消息傳送到已配置的目標(元素)。

網路拓撲

通話範例

從CUCM115上的PSTN 1001到2003的呼叫

基本呼叫路由

傳入網路："PSTN"

觸發程序： "From-PSTN-Trigger"

如果傳入消息與網路「PSTN」匹配，則觸發

路由觸發器： "FromPSTN-RPolicy" "From-PSTN-Trigger"

連結「From-PSTN-Trigger」至「FromPSTN-RPolicy」

路由策略："FromPSTN-RPpolicy"

指定路由表「PSTN-RT」

指定查詢鍵匹配「Prefix-Longest-Match」

指定查詢金鑰為「SIP報頭：「收件人」電話」

路由表："PSTN-RT"

包含要轉至路由組「CUCM115_RG」的金鑰「2」

路由組（或伺服器組）："CUCM115_RG"

包含元素14.50.245.20:5065

這些配置結合起來形成邏輯語句：

對於來自PSTN的呼叫（電話號碼字首為2），路由到14.50.245.20:5065

組態

PSTN - 2XXX和5XXX呼叫通過CUBE和vCUBE傳送到CUSP

CUCM 10.5 - 1XXX和2XXX通過SIP中繼傳送到CUSP

CUCM 11.5 - 1XXX和5XXX通過SIP中繼傳送到CUSP

附註：使用GUI時，必須提交某些配置才能在其他配置部分獲得這些配置。這些標籤有###Commit Configuration

關鍵配置元素

CLI組態	GUI配置
建立網路
sip網路PSTN標準	配置>>網路>>新增
定義偵聽埠以標識網路「PSTN」
sip listen PSTN udp 14.50.245.9 5060	配置>>網路>> [網路名稱] >> SIP偵聽點>>新增
入站網路「PSTN」的觸發器
觸發條件From-PSTN-Trigger 序列1 網路內^\QPSTN\E$ 結束序列結束觸發條件	配置>>觸發器>>新增配置觸發器名稱配置觸發器條件並點選新增
指定「CUCM115_RG」的目標
路由組CUCM115_RG element target-destination 14.50.245.20:5065:udp CUCM115 q-value 0.0 failover-codes 502 - 503 重量50 end元素結束路由	配置>>路由組>>新增(###Commit配置) 配置路由組名稱按一下「元素」列下的「按一下此處」，然後按一下「新增」輸入要素目標
定義路由表並將一個鍵關聯到目標
路由表PSTN-RT 金鑰2組CUCM115_RG key 5組CUCM105_RG 結束路由表	配置>>路由表>>新增(###Commit配置) 配置路由表名稱輸入金鑰和目標在路由表中將路由組配置為目的地時，不要新增埠和傳輸型別。通過新增埠和/或傳輸型別，您指示CUSP查詢DNS主機條目Cubestack:5060:UDP，而不是查詢本地重要的伺服器組配置。
定義「FromPSTN-RPolicy」的金鑰
來自PSTN-RPpolicy的策略查詢序列100 PSTN-RT報頭到uri元件電話規則字首結束序列結束策略	配置>>路由策略>>新增(###Commit配置) 配置路由策略名稱點選Add新增策略步驟策略步驟將定義金鑰的使用方式。在這種情況下，策略將在To:上查詢匹配的最長電話號碼SIP報頭中的欄位
將「From-PSTN-Trigger」連結到「FromPSTN-RPolicy」
觸發路由序列2策略FromPSTN-RPpolicy condition From-PSTN-Trigger	配置>>路由觸發器>>新增選擇要連結到觸發器的路由策略

完整配置

附註：show configuration active verbose將顯示包括路由表在內的整個配置。

josmeado-CUSP(cusp)# show configuration active verbose
Building CUSP configuration...
!
server-group sip global-load-balance weight
server-group sip retry-after 250
server-group sip element-retries udp 2
server-group sip element-retries tls 1
server-group sip element-retries tcp 1
sip dns-srv
 enable
 no naptr
 end dns
!
no sip header-compaction
no sip logging
!
sip max-forwards 70
sip network CUCM105 standard
 no non-invite-provisional
 allow-connections
 no tls verify
 retransmit-count invite-client-transaction 3
 retransmit-count invite-server-transaction 5
 retransmit-count non-invite-client-transaction 3
 retransmit-timer T1 500
 retransmit-timer T2 4000
 retransmit-timer T4 5000
 retransmit-timer TU1 5000
 retransmit-timer TU2 32000
 retransmit-timer clientTn 64000
 retransmit-timer serverTn 64000
 tcp connection-setup-timeout 1000
 tls handshake-timeout 3000
 udp max-datagram-size 1500
 end network
!
sip network CUCM115 standard
 no non-invite-provisional
 allow-connections
 no tls verify
 retransmit-count invite-client-transaction 3
 retransmit-count invite-server-transaction 5
 retransmit-count non-invite-client-transaction 3
 retransmit-timer T1 500
 retransmit-timer T2 4000
 retransmit-timer T4 5000
 retransmit-timer TU1 5000
 retransmit-timer TU2 32000
 retransmit-timer clientTn 64000
 retransmit-timer serverTn 64000
 tcp connection-setup-timeout 1000
 tls handshake-timeout 3000
 udp max-datagram-size 1500
 end network
!
sip network PSTN standard
 no non-invite-provisional
 allow-connections
 no tls verify
 retransmit-count invite-client-transaction 3
 retransmit-count invite-server-transaction 5
 retransmit-count non-invite-client-transaction 3
 retransmit-timer T1 500
 retransmit-timer T2 4000
 retransmit-timer T4 5000
 retransmit-timer TU1 5000
 retransmit-timer TU2 32000
 retransmit-timer clientTn 64000
 retransmit-timer serverTn 64000
 tcp connection-setup-timeout 1000
 tls handshake-timeout 3000
 udp max-datagram-size 1500
 end network
!
sip overload reject retry-after 0
!
no sip peg-counting
!
sip privacy service
sip queue message
 drop-policy head
 low-threshold 80
 size 2000
 thread-count 20
 end queue
!
sip queue radius
 drop-policy head
 low-threshold 80
 size 2000
 thread-count 20
 end queue
!
sip queue request
 drop-policy head
 low-threshold 80
 size 2000
 thread-count 20
 end queue
!
sip queue response
 drop-policy head
 low-threshold 80
 size 2000
 thread-count 20
 end queue
!
sip queue st-callback
 drop-policy head
 low-threshold 80
 size 2000
 thread-count 10
 end queue
!
sip queue timer
 drop-policy none
 low-threshold 80
 size 2500
 thread-count 8
 end queue
!
sip queue xcl
 drop-policy head
 low-threshold 80
 size 2000
 thread-count 2
 end queue
!
route recursion
!
sip tcp connection-timeout 30
sip tcp max-connections 256
!
no sip tls
!
sip tls connection-setup-timeout 1
!
trigger condition From-CUCM105-Trigger
 sequence 1
  in-network ^\QCUCM105\E$
  end sequence
 end trigger condition
!
trigger condition From-CUCM115-Trigger
 sequence 1
  in-network ^\QCUCM115\E$
  end sequence
 end trigger condition
!
trigger condition From-PSTN-Trigger
 sequence 1
  in-network ^\QPSTN\E$
  end sequence
 end trigger condition
!
trigger condition mid-dialog
 sequence 1
  mid-dialog
  end sequence
 end trigger condition
!
accounting
 no enable
 no client-side
 no server-side
 end accounting
!
server-group sip group Cubestack PSTN
 element ip-address 14.50.245.6 5060 udp q-value 0.0 weight 1
 element ip-address 14.50.245.7 5060 udp q-value 0.0 weight 1
 failover-resp-codes 503
 lbtype weight
 ping
 end server-group
!
route group CUCM105_RG
 element target-destination 14.50.245.25:5062:udp CUCM105 q-value 0.0
  failover-codes 510
  weight 50
  end element
 end route
!
route group CUCM115_RG
 element target-destination 14.50.245.20:5065:udp CUCM115 q-value 0.0
  failover-codes 502 - 503
  weight 50
  end element
 end route
!
route table FromCUCM105-RT
 key * target-destination Cubestack PSTN
 key 2 group CUCM115_RG
 end route table
!
route table FromCUCM115-RT
 key 1 target-destination Cubestack PSTN
 key 5 group CUCM105_RG
 end route table
!
route table PSTN-RT
 key 2 group CUCM115_RG
 key 5 group CUCM105_RG
 end route table
!
policy lookup FromCUCM105-RPolicy
 sequence 100 FromCUCM105-RT header to uri-component phone
  rule prefix
  end sequence
 end policy
!
policy lookup FromCUCM115-RPolicy
 sequence 100 FromCUCM115-RT header to uri-component phone
  rule prefix
  end sequence
 end policy
!
policy lookup FromPSTN-RPolicy
 sequence 100 PSTN-RT header to uri-component phone
  rule prefix
  end sequence
 end policy
!
trigger routing sequence 1 by-pass condition mid-dialog
trigger routing sequence 2 policy FromPSTN-RPolicy condition From-PSTN-Trigger
trigger routing sequence 3 policy FromCUCM115-RPolicy condition From-CUCM115-Trigger
trigger routing sequence 4 policy FromCUCM105-RPolicy condition From-CUCM105-Trigger
!
server-group sip global-ping
!
no server-group sip ping-503
!
sip cac session-timeout 720
sip cac PSTN 14.50.245.6 5060 udp limit -1
sip cac PSTN 14.50.245.7 5060 udp limit -1
!
no sip cac
!
sip listen CUCM105 udp 14.50.245.9 5062
sip listen CUCM115 udp 14.50.245.9 5065
sip listen PSTN udp 14.50.245.9 5060
!
call-rate-limit 100
!
end

疑難排解

跟蹤級別配置

在CUSP GUI中，導航至故障排除>> Cisco Unified SIP Proxy >> Trace

Trigger-Conditions - Level:debug:這將顯示哪些觸發器匹配以啟動呼叫路由。

Routing - Level:debug:這將顯示呼叫路由過程中完成的操作。已匹配哪個金鑰、選擇了哪個目標等。

SIP-Wire-Log - Level:debug:這將顯示接收和傳送的SIP消息。

跟蹤收集

通過GUI

在CUSP GUI中，導航至故障排除>> Cisco Unified SIP Proxy >> Trace

選擇下載日誌檔案

您還可以清除日誌

通過FTP客戶端

預設情況下，沒有具有FTP許可權的帳戶。要啟用具有FTP許可權的帳戶，請將使用者新增到PFS組。

josmeado-CUSP# user platformadmin group ?
  Administrators    System administrators group
  pfs-privusers     PFS privileged users group
  pfs-readonly      PFS read only group
josmeado-CUSP# user platformadmin group pfs

通過FTP客戶端連線到CUSP。 檔案路徑：cusp >> log >> trace >> trace.log

跟蹤順序

SIP-Wire-Log — 傳入SIP邀請
SIP-Wire-Log — 返回100嘗試
Trigger-Condition — 確定網路和觸發路由策略
路由 — 有關詳細資訊，請參閱下面的路由跟蹤部分
SIP-Wire-Log — 向目標傳送邀請
SIP-Wire-Log — 繼續正常的SIP事務，直到每個呼叫段都出現200 Ok消息

觸發條件跟蹤示例

13:24:36:987 08:17:2017 vCUSP,9.1.5,josmeado-CUSP,14.50.245.9,trace.log
[REQUESTI.7] DEBUG 2017.08.17 13:25:03:006 conditions.RegexCondition - inNetwork='PSTN'
[REQUESTI.7] DEBUG 2017.08.17 13:25:03:006 conditions.RegexCondition - IN_NETWORK: PSTN
[REQUESTI.7] DEBUG 2017.08.17 13:25:03:006 conditions.AbstractRegexCondition - pattern(^\QPSTN\E$), toMatch(PSTN) returning true
[REQUESTI.7] DEBUG 2017.08.17 13:25:03:006 triggers.ModuleTrigger - ModuleTrigger.eval() action<FromPSTN-RPolicy> actionParameter<>
[REQUESTI.7] DEBUG 2017.08.17 13:25:03:006 triggers.ModuleTrigger - ModuleTrigger.eval() got the policy, executing it ...

在上方範例中，我們看到網路是以PSTN相符的，這用在路由原則「FromPSTN-RPolicy」中。

路由跟蹤示例

13:29:13:453 08:17:2017 vCUSP,9.1.5,josmeado-CUSP,14.50.245.9,trace.log
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 nrs.XCLNRSShiftRoutes - Entering ShiftAlgorithms.execute()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 nrs.XCLNRSShiftRoutes - Leaving ShiftAlgorithms.execute()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 modules.XCLLookup - Entering execute()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 nrs.XCLPrefix - Entering getKeyValue()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 nrs.FieldSelector - getToUri: To header obtained - To: 
      

[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 nrs.FieldSelector - getUriPart: URI - sip:2003@14.50.245.9 part 1
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 nrs.FieldSelector - Requested field 52
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 nrs.FieldSelector - Returning key 2003
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 nrs.XCLPrefix - Leaving getKeyValue()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 modules.XCLLookup - table=PSTN-RT, key=2003
[REQUESTI.7] INFO  2017.08.17 13:29:33:987 modules.XCLLookup - table is PSTN-RT
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 routingtables.RoutingTable - Entering lookup()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 routingtables.RoutingTable - Looking up 2003 in table PSTN-RT with rule prefix and modifiers=none
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 routingtables.RoutingTable - Entering applyModifiers()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:987 routingtables.RoutingTable - Leaving applyModifiers(), returning 2003
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 routingtables.RoutingTable - Leaving lookup()
[REQUESTI.7] INFO  2017.08.17 13:29:33:988 nrs.XCLPrefix - NRS Routing decision is: RouteTable:PSTN-RT, RouteKey:2, RouteGroup:CUCM115_RG
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 loadbalancer.LBFactory - Entering createLoadBalancer()
[REQUESTI.7] INFO  2017.08.17 13:29:33:988 loadbalancer.LBFactory - lbtype is 3(call-id)
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 loadbalancer.LBFactory - Leaving createLoadBalancer()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.XCLPrefix - Stored NRSAlgResult=isFound=true, isFailure=false, Response=-1, Routes=[Ruri: 14.50.245.20:5065:udp, Route: null, Network: CUCM115, q-value=0.0radvance=[502, 503]], PolicyAdvance=null
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.NRSAlgResult - set policyAdvance as specified in route=RouteTable:PSTN-RT, RouteKey:2, RouteGroup:CUCM115_RG
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.NRSAlgResult - no policyAdvance specified in route
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.NRSAlgResult - set policyAdvance as specified in algorithm={lookuprule=1, lookupfield=52, lookuplenght=-1, lookuptable=PSTN-RT, sequence=100, algorithm=1}
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.NRSAlgResult - no policyAdvance specified in algorithm
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 modules.XCLLookup - Leaving execute()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.XCLNRSShiftRoutes - Entering ShiftRoutes.execute()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 loadbalancer.LBBase - Entering getServer()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 loadbalancer.LBBase - Entering initializeDomains()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.NRSRoutes - routes before applying time policies: [Ruri: 14.50.245.20:5065:udp, Route: null, Network: CUCM115, q-value=0.0radvance=[502, 503]] [REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.NRSRoutes - routes after applying time policies: [Ruri: 14.50.245.20:5065:udp, Route: null, Network: CUCM115, q-value=0.0radvance=[502, 503]] [REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 loadbalancer.LBBase - Leaving initializeDomains()
[REQUESTI.7] INFO  2017.08.17 13:29:33:988 loadbalancer.LBHashBased - list of elements in order on which load balancing is done : Ruri: 14.50.245.20:5065:udp, Route: null, Network: CUCM115, q-value=0.0radvance=[502, 503], 
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 loadbalancer.LBBase - Server group route-sg selected Ruri: 14.50.245.20:5065:udp, Route: null, Network: CUCM115, q-value=0.0radvance=[502, 503]
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 loadbalancer.LBBase - Leaving getServer()
[REQUESTI.7] DEBUG 2017.08.17 13:29:33:988 nrs.XCLNRSShiftRoutes - Leaving ShiftRoutes.execute()

1. CUSP獲得TO：中的Key值標題

2. CUSP將金鑰標識為2003

3. CUSP在路由表中查詢金鑰

4. CUSP匹配路由表中的條目並標識目標RouteGroup:CUCM115_RG

5. CUSP在RouteGroup內應用負載均衡

6. CUSP標識它要向其傳送SIP消息的RouteGroup中的特定元素

7. CUSP應用時間策略（如果適用）

8. CUSP最終確定它將向其傳送SIP消息的元素

SIP-Wire-Log跟蹤示例

13:48:26:669 08:17:2017 vCUSP,9.1.5,josmeado-CUSP,14.50.245.9,trace.log
[DsTransportListener-2] DEBUG 2017.08.17 13:48:52:221 DsSipLlApi.Wire - Received UDP packet on 14.50.245.9:5060 ,source 14.50.245.6:50683
INVITE sip:2003@14.50.245.9:5060 SIP/2.0
Via: SIP/2.0/UDP 14.50.245.6:5060;branch=z9hG4bK2A5763
Remote-Party-ID: <sip:1001@14.50.245.6>;party=calling;screen=no;privacy=off
From: <sip:1001@14.50.245.6>;tag=4E329FEC-A9F
To: <sip:2003@14.50.245.9>
Date: Thu, 17 Aug 2017 13:48:52 GMT
Call-ID: 2A7BE22B-82AB11E7-83AEAE0B-F940DC75@14.50.245.6
Supported: 100rel,timer,resource-priority,replaces,sdp-anat
Min-SE:  1800
Cisco-Guid: 0350227076-2191790567-2162465606-1670485135
User-Agent: Cisco-SIPGateway/IOS-15.5.3.S4b
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
CSeq: 101 INVITE
Timestamp: 1502992132
Contact: <sip:1001@14.50.245.6:5060>
Expires: 180
Allow-Events: telephone-event
Max-Forwards: 69
Content-Type: application/sdp
Content-Disposition: session;handling=required
Content-Length: 266

v=0
o=CiscoSystemsSIP-GW-UserAgent 7317 4642 IN IP4 14.50.245.6
s=SIP Call
c=IN IP4 14.50.245.6
t=0 0
m=audio 8266 RTP/AVP 18 127
c=IN IP4 14.50.245.6
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:127 telephone-event/8000
a=fmtp:127 0-16
a=ptime:20

--- end of packet ---

[REQUESTI.7] DEBUG 2017.08.17 13:48:52:223 DsSipLlApi.Wire - Sending UDP packet on 14.50.245.9:32789, destination 14.50.245.6:5060
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 14.50.245.6:5060;branch=z9hG4bK2A5763
To: <sip:2003@14.50.245.9>
From: <sip:1001@14.50.245.6>;tag=4E329FEC-A9F
Call-ID: 2A7BE22B-82AB11E7-83AEAE0B-F940DC75@14.50.245.6
CSeq: 101 INVITE
Timestamp: 1502992132
Content-Length: 0


[REQUESTI.7] DEBUG 2017.08.17 13:48:52:225 DsSipLlApi.Wire - Sending UDP packet on 14.50.245.9:32790, destination 14.50.245.20:5065
INVITE sip:2003@14.50.245.20:5065;transport=udp SIP/2.0
Via: SIP/2.0/UDP 14.50.245.9:5065;branch=z9hG4bKM3X51yKL9BEW5v0Kudc5Dw~~128
Via: SIP/2.0/UDP 14.50.245.6:5060;branch=z9hG4bK2A5763
Max-Forwards: 68
To: <sip:2003@14.50.245.9>
From: <sip:1001@14.50.245.6>;tag=4E329FEC-A9F
Contact: <sip:1001@14.50.245.6:5060>
Expires: 180
Remote-Party-ID: <sip:1001@14.50.245.6>;party=calling;screen=no;privacy=off
Call-ID: 2A7BE22B-82AB11E7-83AEAE0B-F940DC75@14.50.245.6
CSeq: 101 INVITE
Content-Length: 266
Date: Thu, 17 Aug 2017 13:48:52 GMT
Supported: 100rel,timer,resource-priority,replaces,sdp-anat
Min-SE: 1800
Cisco-Guid: 0350227076-2191790567-2162465606-1670485135
User-Agent: Cisco-SIPGateway/IOS-15.5.3.S4b
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
Timestamp: 1502992132
Allow-Events: telephone-event
Content-Type: application/sdp
Content-Disposition: session;handling=required

v=0
o=CiscoSystemsSIP-GW-UserAgent 7317 4642 IN IP4 14.50.245.6
s=SIP Call
c=IN IP4 14.50.245.6
t=0 0
m=audio 8266 RTP/AVP 18 127
c=IN IP4 14.50.245.6
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:127 telephone-event/8000
a=fmtp:127 0-16
a=ptime:20

[DsTransportListener-3] DEBUG 2017.08.17 13:48:52:229 DsSipLlApi.Wire - Received UDP packet on 14.50.245.9:5065 ,source 14.50.245.20:5065
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 14.50.245.9:5065;branch=z9hG4bKM3X51yKL9BEW5v0Kudc5Dw~~128,SIP/2.0/UDP 14.50.245.6:5060;branch=z9hG4bK2A5763
From: <sip:1001@14.50.245.6>;tag=4E329FEC-A9F
To: <sip:2003@14.50.245.9>
Date: Thu, 17 Aug 2017 17:48:52 GMT
Call-ID: 2A7BE22B-82AB11E7-83AEAE0B-F940DC75@14.50.245.6
CSeq: 101 INVITE
Allow-Events: presence
Content-Length: 0


--- end of packet ---

[DsTransportListener-3] DEBUG 2017.08.17 13:48:52:284 DsSipLlApi.Wire - Received UDP packet on 14.50.245.9:5065 ,source 14.50.245.20:5065
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 14.50.245.9:5065;branch=z9hG4bKM3X51yKL9BEW5v0Kudc5Dw~~128,SIP/2.0/UDP 14.50.245.6:5060;branch=z9hG4bK2A5763
From: <sip:1001@14.50.245.6>;tag=4E329FEC-A9F
To: <sip:2003@14.50.245.9>;tag=93896~37db7c49-96d4-4c4c-a223-626b2c74c16a-16919968
Date: Thu, 17 Aug 2017 17:48:52 GMT
Call-ID: 2A7BE22B-82AB11E7-83AEAE0B-F940DC75@14.50.245.6
CSeq: 101 INVITE
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
Allow-Events: presence
Server: Cisco-CUCM11.5
Call-Info: <urn:x-cisco-remotecc:callinfo>;x-cisco-video-traffic-class=DESKTOP
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Session-ID: 1e6e772300105000a00084b517ae1a83;remote=c07cdfa83b8f7c373757cf842ab93896
P-Asserted-Identity: "Alerting JM1 - 2003" <sip:2003@14.50.245.20>
Remote-Party-ID: "Alerting JM1 - 2003" <sip:2003@14.50.245.20>;party=called;screen=yes;privacy=off
Contact: <sip:2003@14.50.245.20:5065>;+u.sip!devicename.ccm.cisco.com="SEP84B517AE1A83"
Content-Length: 0


--- end of packet ---

[CT_CALLBACK.15] DEBUG 2017.08.17 13:48:52:285 DsSipLlApi.Wire - Sending UDP packet on 14.50.245.9:32789, destination 14.50.245.6:5060
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 14.50.245.6:5060;branch=z9hG4bK2A5763
To: <sip:2003@14.50.245.9>;tag=93896~37db7c49-96d4-4c4c-a223-626b2c74c16a-16919968
From: <sip:1001@14.50.245.6>;tag=4E329FEC-A9F
Contact: <sip:2003@14.50.245.20:5065>;+u.sip!devicename.ccm.cisco.com="SEP84B517AE1A83"
Remote-Party-ID: "Alerting JM1 - 2003" <sip:2003@14.50.245.20>;party=called;screen=yes;privacy=off
Call-ID: 2A7BE22B-82AB11E7-83AEAE0B-F940DC75@14.50.245.6
CSeq: 101 INVITE
Content-Length: 0
Date: Thu, 17 Aug 2017 17:48:52 GMT
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
Allow-Events: presence
Server: Cisco-CUCM11.5
Call-Info: <urn:x-cisco-remotecc:callinfo>;x-cisco-video-traffic-class=DESKTOP
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Session-ID: 1e6e772300105000a00084b517ae1a83;remote=c07cdfa83b8f7c373757cf842ab93896
P-Asserted-Identity: "Alerting JM1 - 2003" <sip:2003@14.50.245.20>


[DsTransportListener-3] DEBUG 2017.08.17 13:48:54:292 DsSipLlApi.Wire - Received UDP packet on 14.50.245.9:5065 ,source 14.50.245.20:5065
SIP/2.0 200 OK
Via: SIP/2.0/UDP 14.50.245.9:5065;branch=z9hG4bKM3X51yKL9BEW5v0Kudc5Dw~~128,SIP/2.0/UDP 14.50.245.6:5060;branch=z9hG4bK2A5763
From: <sip:1001@14.50.245.6>;tag=4E329FEC-A9F
To: <sip:2003@14.50.245.9>;tag=93896~37db7c49-96d4-4c4c-a223-626b2c74c16a-16919968
Date: Thu, 17 Aug 2017 17:48:52 GMT
Call-ID: 2A7BE22B-82AB11E7-83AEAE0B-F940DC75@14.50.245.6
CSeq: 101 INVITE
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
Allow-Events: presence, kpml
Supported: replaces
Server: Cisco-CUCM11.5
Call-Info: <urn:x-cisco-remotecc:callinfo>;x-cisco-video-traffic-class=DESKTOP
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Session-Expires:  1800;refresher=uas
Require:  timer
Session-ID: 1e6e772300105000a00084b517ae1a83;remote=c07cdfa83b8f7c373757cf842ab93896
P-Asserted-Identity: "CLID JM1 - 2003" <sip:2003@14.50.245.20>
Remote-Party-ID: "CLID JM1 - 2003" <sip:2003@14.50.245.20>;party=called;screen=yes;privacy=off
Contact: <sip:2003@14.50.245.20:5065>;+u.sip!devicename.ccm.cisco.com="SEP84B517AE1A83"
Content-Type: application/sdp
Content-Length: 258

v=0
o=CiscoSystemsCCM-SIP 93896 1 IN IP4 14.50.245.20
s=SIP Call
c=IN IP4 14.50.245.254
b=TIAS:8000
b=AS:8
t=0 0
m=audio 16502 RTP/AVP 18 101
a=ptime:20
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

--- end of packet ---

[CT_CALLBACK.15] DEBUG 2017.08.17 13:48:54:293 DsSipLlApi.Wire - Sending UDP packet on 14.50.245.9:32789, destination 14.50.245.6:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 14.50.245.6:5060;branch=z9hG4bK2A5763
To: <sip:2003@14.50.245.9>;tag=93896~37db7c49-96d4-4c4c-a223-626b2c74c16a-16919968
From: <sip:1001@14.50.245.6>;tag=4E329FEC-A9F
Contact: <sip:2003@14.50.245.20:5065>;+u.sip!devicename.ccm.cisco.com="SEP84B517AE1A83"
Require: timer
Remote-Party-ID: "CLID JM1 - 2003" <sip:2003@14.50.245.20>;party=called;screen=yes;privacy=off
Call-ID: 2A7BE22B-82AB11E7-83AEAE0B-F940DC75@14.50.245.6
CSeq: 101 INVITE
Content-Length: 258
Date: Thu, 17 Aug 2017 17:48:52 GMT
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
Allow-Events: presence, kpml
Supported: replaces
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Server: Cisco-CUCM11.5
Call-Info: <urn:x-cisco-remotecc:callinfo>;x-cisco-video-traffic-class=DESKTOP
Session-Expires: 1800;refresher=uas
Session-ID: 1e6e772300105000a00084b517ae1a83;remote=c07cdfa83b8f7c373757cf842ab93896
P-Asserted-Identity: "CLID JM1 - 2003" <sip:2003@14.50.245.20>
Content-Type: application/sdp

v=0
o=CiscoSystemsCCM-SIP 93896 1 IN IP4 14.50.245.20
s=SIP Call
c=IN IP4 14.50.245.254
b=TIAS:8000
b=AS:8
t=0 0
m=audio 16502 RTP/AVP 18 101
a=ptime:20
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

SIP-Wire-Log顯示通常的SIP消息，最大為200 Okay，對於兩個呼叫段。

架構參考

由思科工程師貢獻

Joshua Meadows
Cisco TAC工程師